Characteristics of patients who underwent adult spinal deformity surgery in July and other months between 2002 and 2011.
| Variable | July | Other months | p-value |
|---|---|---|---|
| Total | 2,023 | 25,771 | |
| Age (average years) | 56 ± 16 | 58 ± 15 | 0.040 |
| Age > 65 (%) | 30.4 | 35.0 | 0.057 |
| Female gender (%) | 76.3 | 74.7 | 0.468 |
| Race | |||
| Caucasian (%) | 91.4 | 91.3 | 0.933 |
| African American (%) | 3.8 | 3.5 | |
| Hispanic (%) | 1.7 | 2.2 | |
| Other (%) | 3.1 | 3.0 | |
| Primary payer | |||
| Medicare (%) | 38.5 | 41.7 | 0.183 |
| Medicaid (%) | 7.2 | 4.5 | |
| Private insurance (%) | 50.2 | 50.1 | |
| Other (%) | 4.1 | 3.7 | |
| Elixhauser comorbidity score (average) | 1.8 ± 1.7 | 1.8 ± 1.6 | 0.644 |
| Fusion of 8 or more segments (%) | 25.4 | 20.9 | 0.031 |
| Osteotomy (%) | 6.7 | 7.1 | 0.768 |
| Revision procedures (%) | 5.0 | 4.9 | 0.933 |